Granted Patent
Utility
US 6,489,787 · App. 09/689,990
Gas detection circuit
Inventor:
Edward F. McFadden
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Oct 13, 2000
Inventor
Edward F. McFadden
Assignee (at issue)
BACHARACH, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.